Poop, usually, is pushed out using your muscles, so unless you are in a life or death situation that causes your bowels to loosen, or you have an illness or imbalance that causes your body to need to expel your waste, or you are simply backed up way too much, your body will generally be able to hold in your solid waste for a time. And unless you continue eating, it probably won’t back up too far.
But your pee is just a liquid, filling up a small bladder. The muscles required for peeing are usually about keeping the liquid waste in, and not expelling it, so when the liquid backs up too far, the floodgates open. Once it starts, its hard to stop it.
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